Ok, well sorry to be pedantic then. So many people mean so many things when one says "internal" that I try not to use it in any qualified remark (I'm perfectly comfortable calling yiquan, bagua, etc. "internal", but from my instructor to Bernie Langan to Kevin Menard to Tao He (my sample size is small), I've yet to see two folks from different schools who seem to actually be doing the same thing that they're all referring by this same term.). I'll be less pendantic forthwith. :)

PatfromLogan- He is actually on the Big Island this weekend (9/14-16) probably right in your backyard. You can try to contact the guys at the numbers listed here- http://www.yiquanhawaii.com/classes.html

Rather than explosively accelerating one's mass towards an opponent and then braking using one's fist, a competent yiquan punch is direct expansion into the adversary, with very little net momentum built up. You'll very often see a little "pop" at the end of a yiquan guy's practice punches when there's no target: this can be indicative of someone practicing the transition from "connecting" to "expanding". At much higher levels than I ever achieved, this transition is seamless.